// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef UI_GFX_GEOMETRY_SIZE_BASE_H_
#define UI_GFX_GEOMETRY_SIZE_BASE_H_

#include "ui/gfx/gfx_export.h"

namespace gfx {

// A size has width and height values.
template <typename Class, typename Type>
class GFX_EXPORT SizeBase {
public:
    Type width() const { return width_; }
    Type height() const { return height_; }

    Type GetArea() const { return width_ * height_; }

    void SetSize(Type width, Type height)
    {
        set_width(width);
        set_height(height);
    }

    void Enlarge(Type width, Type height)
    {
        set_width(width_ + width);
        set_height(height_ + height);
    }

    void set_width(Type width)
    {
        width_ = width < 0 ? 0 : width;
    }
    void set_height(Type height)
    {
        height_ = height < 0 ? 0 : height;
    }

    void SetToMin(const Class& other)
    {
        width_ = width_ <= other.width_ ? width_ : other.width_;
        height_ = height_ <= other.height_ ? height_ : other.height_;
    }

    void SetToMax(const Class& other)
    {
        width_ = width_ >= other.width_ ? width_ : other.width_;
        height_ = height_ >= other.height_ ? height_ : other.height_;
    }

    bool IsEmpty() const
    {
        return (width_ == 0) || (height_ == 0);
    }

protected:
    SizeBase(Type width, Type height)
        : width_(width < 0 ? 0 : width)
        , height_(height < 0 ? 0 : height)
    {
    }

    // Destructor is intentionally made non virtual and protected.
    // Do not make this public.
    ~SizeBase() { }

private:
    Type width_;
    Type height_;
};

} // namespace gfx

#endif // UI_GFX_GEOMETRY_SIZE_BASE_H_
